Dividers and center-punch.



C. ANTROBUS.

DIVIDERS AND CENTER PUNCH.

APPLlCATlON FILED JUNE 12, 1915.

1 15 Q2Q I Patented Oct. 26, 1915.

UNTTEE %TATE% PATENT @FFTQE.

CHARLES ANTROBUS, OF THE UNITED STATES NAVY.

DIVIDERS AND CENTER-PUNOH.

Application filed. June 12, 1915.

l '0 all whom it may concern:

Be it known that 1, CHARLES ANrRoBUs, a citizen of the United States, temporarily residing at Annapolis, Anne Arundel county, State of Maryland, have invented certain new and useful Improvements in Dividers and Center-Punches, of which the following is a specification.

The present invention relates to a combined dividers and center punch and the object of the invention is to provide an instrument of this character in which the center punch will be maintained in proper working relation without requiring the at tention of the user.

The tool or instrument is particularly designed and adapted for use in laying out work and punching center marks by a single operation and insuring that the punch will be held in proper vertical position under all adjustments and without requiring a special setting by the user at each operation. It will be appreciated that such instruments are frequently employed where, owing to poor light, rough surfaces or the work being in a place difficult of access, the operator cannot readily adjust the punch into proper working position and the primary object of the present invention is to effect such adjustment automatically, thereby saving the time that has been necessarily required where manually adjustable means only were employed for connecting the punch and dividers.

In the accompanying drawing, Figure 1 is an elevation of an embodiment of the invention showing the legs of the dividers separated to their maximum extent; Fig. 2 is an end elevation; Fig. 3 illustrates the position of parts when the legs of the dividers are relatively closer together than in Fig. 1; Fig. 4 shows the parts completely closed; and Fig. 5 illustrates a modification in which each leg of the dividers supports a punch.

While the invention may be embodied in various forms of dividers, or similar instruments, it is herein illustrated as applied to a common form comprising two legs, A, B, pivotally connected adjacent their upper ends as at C and further connected by a spring D which acts to separate the said legs. lhe extent of separation of the legs A, B, is, in the embodiment of the invention illustrated, controlled a screw Specification of Letters Patent.

Patented Oct. 26, 1915.

Serial No. 33,754.

E pivotally mounted on one of the legs and extending through a suitable post on the other leg, and a nut F mounted on said screw and adaptetd to bear against the post referred to.

A center punch G is pivotally mounted on the leg A and a lateral projection 9 thereon is engaged by the bifurcated end of a lever H pivotally mounted at 7t on the leg A and, in the embodiment of the invention illustrated, having its other end slotted and receiving a portion of the post on the leg B through which the adjusting screw E extends.

The lever H is of such form and the several parts of the device are so related that, as the distance between the legs A, B is varied, the center punch will be adjusted about its pivotal connection with the leg A so that, assuming the instrument to be acting upon a horizontal surface, said punch will be maintained in a vertical position at all times.

It will be understood that there can be considerable variation in the details of the embodiment of the invention illustrated without departing from the spirit thereof. Any suitable form of punch G may be employed and the particular form of lever H and the slots therein may be varied as desired, these parts having been illustrated more or less conventionally.

As shown, the invention could be em bodied in an instrument in which both legs A, B, are provided with center punches I, I, as shown in Fig. 5, each being connected with a suitable actuating lever.

Preferably the connection between the punch G and lever H includes a threaded post and thumb nut, or equivalent device, by which the punch and lever may be rigidly connected. This feature is not essential when the parts are very accurately matched but is provided in order to maintain the efliciency of the instrument when, after considerable use, there has been a slight wear between the contacting surfaces.

The manner of using the tool and the advantages thereof will be readily understood and appreciated from the foregoing description and the drawing. It will be seen that the punch is always maintained in position to be struck by a hammer and parallel to the axis about which the instrument is turned.

Having thus described the invention, what is claimed is:

1. A combined divider and center punch comprising two pivotally connected legs, a spring tending to separate the legs, adjustable means controlling the separation of the legs under the action of the spring,'a center punch pivotally mounted on one of the legs,

and a lever fulcrumed 0n the same leg as the punch and having a pin and slot connection with the other leg, whereby the punch engaging lever will be rocked as the distance between the legs is varied substantially as and for the purpose described.

2. Acombined tool comprising two pivotally connected legs, a center punch pivotally supported on one leg, a lever fulcrumed on the same leg as the punch and adapted to adjust the latter about its pivot 20 as the lever is rocked, and means on the other leg for rocking the lever as the distance between the legs is varied, substantially as and for the purpose described.

3. A combined divider and center punch comprising two pivotally connected legs, a spring tending to separate the legs, a screw and nut adjustment controlling the sej'mration of the legs under the action of the spring, a center punch pivotally mounted on one of the legs, and means controlled by said screw and nut for adjusting the punch about its pivot as the distance between the legs is varied, for the purpose described.

In testimony whereof I afi ix my signature.

CHARLES ANTROBUS.

itnesses J NO. T. Pnnnrcoon, T. W. SMiTH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. O. 

